I have a VGA box splitter but it is only making my display mirror on my two external monitors (can extend from laptop screen, but the two externals mirror each other).

Will getting a hdmi to vga converter and plugging them in directly work? How can I best have both screens be an extension of mine?

Another option would be to turn off my main display somehow, and just display on the two external monitors. As long as they extend the desktop, that'd be perfect.

Advice much appreciated.